Here goes:
1. Turn on the device and connect to wifi. (I always turn wifi off when I am using it for only reading because I believe it saves the battery).
2. On the top selection carousel, hit "Web".
3. In the LH corner you will an icon with 3 stripes (best way I can describe it) or a "stack". Touch that which takes you to 'Help and Feedback' screen.
4. From the list that appears on the LH side select 'Help'.
5. On the list that now appears, browse 'User's Guide' - most of what you need to know is on there.
Other than the above, there are user forums on Amazon Kindle, if you log on to your account.